Question

a certain spring has a force costant of K=25N/cm.

(a) of an object with mass of 500g were hung from spring, how far in cm would it strech?

(b) what is the mass of an object that streches the spring 35cm?

Answer 1

(a) $F=kx\to x=F/k=0.5\cdot9.8/2500=0.00196\ (m)\approx0.196\ (cm)$

(b) $mg=kx\to m=kx/g=2500\cdot0.35/9.8=89.3\ (kg)$